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Short-term Financing (Narrative) (Details) - USD ($) $ in Millions |  |  |  |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 24, 2024 | Jun. 01, 2024 | Apr. 12, 2024 | Apr. 11, 2024 | Feb. 03, 2023 | Feb. 06, 2020 | May 31, 2024 | May 31, 2023
2019 Credit Facility [Member] | JP Morgan Chase Bank, N.A. [Member] |  |  |  |  |  |  |  |
Financing [Line Items] |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  | $ 1,000.0 |  |  |  |  |
Term of unsecured line of credit facility |  |  | 5 years |  |  |  |  |
Expiration date |  |  | Apr. 12, 2029 | Jul. 31, 2024 |  |  |  |
2017 Credit Facility [Member] | JP Morgan Chase Bank, N.A. [Member] |  |  |  |  |  |  |  |
Financing [Line Items] |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  | $ 750.0 |  |  |  |  |
Term of unsecured line of credit facility |  |  | 5 years |  |  |  |  |
2020 Credit Facility [Member] | PNC Bank, National Association [Member] |  |  |  |  |  |  |  |
Financing [Line Items] |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  | $ 250.0 |  |  |
Term of unsecured line of credit facility |  |  |  |  | 3 years |  |  |
Expiration date |  |  |  |  | Feb. 06, 2026 | Feb. 06, 2023 |  |
Revolving Credit Facility [Member] |  |  |  |  |  |  |  |
Financing [Line Items] |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  | $ 2,000.0 |
Standby Letters of Credit [Member] |  |  |  |  |  |  |  |
Financing [Line Items] |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  | 168.5 | $ 141.7
Amounts outstanding |  |  |  |  |  |  | $ 0.0 | $ 0.0
Standby Letters of Credit [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |
Financing [Line Items] |  |  |  |  |  |  |  |
Expiration date | Jun. 24, 2024 |  |  |  |  |  |  |
Renewal term |  | 1 year |  |  |  |  |  |
Minimum [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |  |
Financing [Line Items] |  |  |  |  |  |  |  |
Commitment fee, percentage |  |  |  |  |  |  | 0.05% |
Minimum [Member] | Standby Letters of Credit [Member] |  |  |  |  |  |  |  |
Financing [Line Items] |  |  |  |  |  |  |  |
Expiration date |  |  |  |  |  |  | Jun. 26, 2024 |
Maximum [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |  |
Financing [Line Items] |  |  |  |  |  |  |  |
Commitment fee, percentage |  |  |  |  |  |  | 0.15% |
Maximum [Member] | Standby Letters of Credit [Member] |  |  |  |  |  |  |  |
Financing [Line Items] |  |  |  |  |  |  |  |
Expiration date |  |  |  |  |  |  | Sep. 29, 2025 |

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